# Flood measures by spatial unit

The dataset consists of two files containing flood measures aggregated to the county and ZIP code-level, respectively from 2000-2018 and derived from the Global Flood Database's high-resolution satellite-based flood maps. This file serves as a data dictionary that describes the variables contained in each dataset. 

## Variables 
-`id`: 4-digit unique flood exposure event identifier from Dartmouth Flood Observatory 

-`county/zipcode` : the spatial unit's 5-digit FIPS county code or 5-digit ZIP Code

-`county_name`: name of FIPS county (only applicable to `floods_county_2000_2018.rds`)

-`state_abbrev`: 2-letter state abbreviation corresponding to the FIPS county or ZIP Code 

-`pct_flooded`: among flooded pixels in the spatial unit, the mean amount of flood exposure event experienced as a percentage

-`avg_duration`: among flooded pixels in the spatial unit, the mean length of flood exposure event in days

-`median_duration`: among flooded pixels in the spatial unit, the median length of flood exposure event in days 

-`total_duration`: among flooded pixels in the spatial unit, the maximum length of flood exposure event in days 

-`start`: start date of flood exposure event from Dartmouth Flood Observatory, written as YYYY-MM-DD

-`main_cause`: primary cause of flood exposure event from Dartmouth Flood Observatory  

-`severity`: severity class as defined by the Dartmouth Flood Observatory (3 distinct values: 1, 1.5, or 2) 
